Electro-chemical sensor

Details Electro-chemical sensor Electro-chemical sensor

1974-03-04

1977-05-03

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

G01N 2746

Patent

active

040213269

ABSTRACT:
Electro-chemical sensor to determine oxygen concentration in hot internal combustion exhaust gases in the form of a closed, tubular element having a solid ion conductive electrolyte; an electron-conductive coating on the inner surface thereof; a porous or fissured electron conductive layer on the outer surface of said solid electrolyte or on a part of said surface, part of the pores or fissures being macroporous, said layer being of a material which catalyzes the formation from said hot exhaust gases of those compounds that are thermodynamically stable at the exhaust temperature; and a porous protective electrically insulating coating on said porous electron-conductive layer. Preferably, a top coating of a heat-resistant metal is applied, which top coating has additionally properties to act as a getter with respect to poisons affecting the catalyzing material.

REFERENCES:
patent: 3347767 (1967-10-01), Hickam
patent: 3403090 (1968-09-01), Tajiri et al.
patent: 3468780 (1969-09-01), Fischer
patent: 3503809 (1970-03-01), Spacil
patent: 3578578 (1971-05-01), VON Krusenstierna
patent: 3645875 (1972-02-01), Record et al.
patent: 3654112 (1972-04-01), Beekmans et al.
patent: 3841987 (1974-10-01), Friese et al.
J. D. Tretjakow et al., Berichte der Bunsengeselchaft, vol. 69, No. 5, pp. 396-402, (1965).

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